Nut upsuser - Jan 2010 - Shutdowns occuring without power outage.

I am running an older version of nut (2.0.2) on a FreeBSD 4.11 machine. This
has been running fine for many months until the last few weeks. It seems that
several times a week the machine is shutting itself down. Looking at the log
files I notice these lines which lead me to think there is something wrong
with the serial communication betwen my host and the Ellipse 600 UPS. 

Jan  5 04:49:02 bng-sb-clk upsmon[207]: Poll UPS [clkups at localhost] failed -
Data stale
Jan  5 04:49:37 bng-sb-clk last message repeated 7 times
Jan  5 04:50:52 bng-sb-clk last message repeated 15 times
Jan  5 04:50:52 bng-sb-clk upsd[202]: UPS [clkups] data is no longer stale
Jan  5 04:51:13 bng-sb-clk upsd[202]: Data for UPS [clkups] is stale - check
driver
Jan  5 04:51:17 bng-sb-clk upsmon[207]: Poll UPS [clkups at localhost] failed -
Data stale
Jan  5 04:51:32 bng-sb-clk last message repeated 3 times
Jan  5 04:51:32 bng-sb-clk upsmon[207]: Executing automatic power-fail shutdown
Jan  5 04:51:33 bng-sb-clk shutdown: halt by root: 
Jan  5 04:51:36 bng-sb-clk clock: X98nut running now
Jan  5 04:51:36 bng-sb-clk clock: Checking POWERDOWN log file
Jan  5 04:51:36 bng-sb-clk clock: Shutdown due to Power outage

Breaking the problem into 2:

1. Why are there so many failed - Data stale errors. Whenever I manually do a
   'upsc' I always receive a valid response.

2. How can I control what warnings trigger a shutdown. Can I disable the
   shutdown on a stale data error. I am aware of the side effects but a
   running system is still better than an incorrect cleanly shutdown system.

-- 
Daryl Sayers                             Direct: +612 95525510
Corinthian Engineering                   Office: +612 95525500
Suite 54, Jones Bay Wharf                   Fax: +612 95525549
26-32 Pirrama Rd                          email: daryl at ci.com.au
Pyrmont NSW 2009 Australia                  www: http://www.ci.com.au

Citeren Daryl Sayers <daryl op ci.com.au>:
> I am running an older version of nut (2.0.2) on a FreeBSD 4.11 machine.
Please upgrade to a more recent version. The one you're using now is  
well over five years old and is no longer supported.

[...]
> 1. Why are there so many failed - Data stale errors. Whenever I manually do
a
>    'upsc' I always receive a valid response.
Most likely because there was a problem with the communication with  
the driver socket. There was an error in the staleness logic in older  
versions of the 'upsd' server, which caused it to declare the driver  
stale after the first failure. Upgrade.
> 2. How can I control what warnings trigger a shutdown. Can I disable the
>    shutdown on a stale data error. I am aware of the side effects but a
>    running system is still better than an incorrect cleanly shutdown
system.
No. NUT errs on the side of caution. If the UPS is known to be on  
battery and there is a communication problem with the driver socket,  
the system shuts down. You can't (and shouldn't change) that.

Best regards, Arjen
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